The ECHO 40 is a PIFA (Planar Inverted F Antenna) which can be screwed to any surface or PCB and soldered to the ground plane. The reported performance is gained with a metal ground plane attached to the lugs.
Impedance: 50 ?
Gain: 0 to 2dBi
SWR: ≤ 3
Radiation: Omnidirectional
Polarisation: Vertical

Frequency bands
689 to 960 MHz @ 0 dBi gain
1710 to 2710 MHz @ 2 dBi gain
2500 to 2700 MHz @ 2dBi gain

Dimensions
Length: 90.3 mm
Width: 30 mm
Height: 3 mm
Weight: 26 grams